Silver and black composite film and white film spaced mulch

Abstract

The invention discloses a silver and black composite film and white film spaced mulch. The mulch comprises silver layer films, black layer films and white films and is characterized in that the silver layer films and the black layer films are composited to form silver and black composite film segments; the silver and black composite film segments and the white films are spaced; the adjacent edges of the silver and black composite film segments and the white films are combined into a whole via V grooves. The mulch has the beneficial effects that the silver layer films and the black layer films are composited and are spaced by the white films and the spacing distance can be selected according to the growth requirements of different crops, so not only can light be reflected via silver gray or white and heat be absorbed by black but also the ranges of application of the crops can not be reduced and the functions of preserving moisture, preserving heat, improving the soil properties, increasing the nutrient utilization rate, changing the growing period, controlling weeds and avoiding insect pests are further improved comprehensively; by taking low-price linear low density polyethylene as a main material and increasing the proportion of a silver gray masterbatch, the mulch is low in production cost, has good reflective rate and strong aging resistance and is beneficial to application in south China.

Description

technical field [0001] The invention relates to an improvement of a mulching film, in particular to a mulching film in which a silver-black composite film and a white film are arranged at intervals and have multiple protective functions. Background technique [0002] The mulch film currently used is a white transparent polyethylene agricultural film, which is mainly used for moisturizing, heat preservation, improving soil properties, increasing nutrient utilization, changing the growth period of crops, and of course it also has the function of weeding and pest avoidance. However, this kind of mulch film, because it is a single white color, can only have the functions of whiteness, moisture retention, heat preservation, improvement of soil properties, increase of nutrient utilization rate, change of crop growth period, weeding and insect pest avoidance. For weeds and insect pests that can adapt to white cannot be avoided. In order to improve the weed and insect pest removal ...

AI Technical Summary

Problems solved by technology

However, this kind of mulch film, because it is a single white color, can only have the functions of whiteness, moisture retention, heat preservation, improvement of soil properties, increase of nutrient utilization rate, change of crop growth period, weeding and insect pest avoidance. For weeds and insect pests that can adapt to white can not be avoided

In order to improve the weed and insect pest removal characteristics of the mulch film, Chinese patent CN203072517U discloses "a two-color polyethylene agricultural mulch film", which is composed of upper and lower layers. The upper layer is silver gray or white, and the lower layer is black. Reflect light and absorb heat through black, but because it is composited as a whole, and because of the reflection of light, it affects the light, which will reduce the scope of application of crops; among them: the raw materials used for silver gray or white film are: linear low density 50Kg of polyethylene, 48 Kg of low density polyethylene, 2 Kg of silver gray or white mother; the raw materials used for black are: linear low density polyethylene 50Kg, 49 Kg of low density polyethylene, 1Kg of black mother

The disadvantage of the above formula is: due to the large proportion of low-density polyethylene, and the price of low-density polyethylene is about 1,000 yuan per ton higher than that of linear low-density polyethylene, so the production cost is increased. The elongation at break is also too small, the proportion of silver-gray masterbatch is too small, the reflectivity is too poor, the black masterbatch 1KG is too little, and the anti-aging performance is also poor, which is not conducive to the application in southern China

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